Ion Manipulation from Liquid Xe to Vacuum: Ba-Tagging for a nEXO Upgrade and Future 0νββ Experiments
Neutrinoless double beta decay (0νββ) provides a way to probe physics beyond the Standard Model of particle physics. The upcoming nEXO experiment will search for 0νββ decay in 136Xe with a projected half-life sensitivity exceeding 1028 years at the 90% confidence level using a liquid xenon (LXe) Time Projection Chamber (TPC) filled with 5 tonnes of Xe enriched to ∼90% in the ββ-decaying isotope 136Xe. In parallel, a potential future upgrade to nEXO is being investigated with the aim to further suppress radioactive backgrounds and to confirm ββ-decay events. This technique, known as Ba-tagging, comprises extracting and identifying the ββ-decay daughter 136Ba ion. One tagging approach being pursued involves extracting a small volume of LXe in the vicinity of a potential ββ-decay using a capillary tube and facilitating a liquid-to-gas phase transition by heating the capillary exit. The Ba ion is then separated from the accompanying Xe gas using a radio-frequency (RF) carpet and RF funnel, conclusively identifying the ion as 136Ba via laser-fluorescence spectroscopy and mass spectrometry. Simultaneously, an accelerator-driven Ba ion source is being developed to validate and optimize this technique. The motivation for the project, the development of the different aspects, along with the current status and results, are discussed here.
Authors
- Alec Iverson
- Raad Shaikh (ORCID: https://orcid.org/0000-0002-0214-0280)
- J. Dilling
- R. Collister
- M. Cvitan
- M. Medina-Peregrina
- R. Gornea
- Xiao Shang (ORCID: https://orcid.org/0009-0007-0888-5746)
- Richard P. Ross
- K.S. Murray
- D. Fudenberg
- Victor Varentsov (ORCID: https://orcid.org/0000-0002-1428-2593)
- R. Elmansali
- T. Daniels
- J Soderstrom
- D. Ray
- A. Lennarz (ORCID: https://orcid.org/0000-0002-8138-0126)
- W. M. Fairbank
- T. Brunner (ORCID: https://orcid.org/0000-0002-3131-8148)
- K. G. Leach (ORCID: https://orcid.org/0000-0002-4751-1698)
- A. A. Kwiatkowski
- H. Rasiwala (ORCID: https://orcid.org/0000-0001-6251-4507)
- Zepeng Li (ORCID: https://orcid.org/0000-0003-2837-3290)
- C. Chambers (ORCID: https://orcid.org/0000-0001-7952-9609)
- Lina Yang (ORCID: https://orcid.org/0000-0001-5272-050X)
- G. Gratta (ORCID: https://orcid.org/0000-0002-6372-1628)
- Kevin O’Sullivan
- Lucas Backes
- Ali V. Balbuena
- Iroise Casandjian
Institutions
- TRIUMF (CA)
- University of British Columbia (CA)
- University of North Carolina Wilmington (US)
- Colorado School of Mines (US)
- University of Victoria (CA)
- University of California San Diego (US)
- Facility for Antiproton and Ion Research (DE)
- McGill University (CA)
- Carleton University (CA)
- Michigan State University (US)
- Colorado State University (US)
- Stanford University (US)
- McMaster University (CA)
Publication Details
- Journal
- Atoms
- Published
- 2024-12-19
- DOI
- https://doi.org/10.3390/atoms12120071
- Citations
- 3
- Primary Topic
- Neutrino Physics Research
- Type
- article
- Field-Weighted Citation Impact
- 1.98
Funders
- National Science Foundation
- TRIUMF
- Canada Foundation for Innovation
- Canada First Research Excellence Fund
- Natural Sciences and Engineering Research Council of Canada